The cumulative annual radiation doses of workers at the Fukushima No. 1 plant rose more than 16-fold from the year before during the first year of the nuclear crisis, Tokyo Electric Power Co. data show.
Over a roughly one-year period from the March 2011 meltdowns and the end of February, cumulative radiation doses came to 244.6 man-sieverts per worker — a more than 16-fold surge compared with the 14.9 man-sieverts measured in the previous year, the data showed.
March 2011 alone accounted for around half of the figure, some 120.2 man-sieverts, while the highest exposure recorded for an individual worker stood at 678.8 millisieverts.
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